质心能量200 GeV d+Au碰撞粒子横动量谱的Tsallis统计分析  

Study on the transverse-momentum spectra in 200 GeV d+Au collisions with the Tsallis statistics

作　　者：朱银莹 邵明[1] 

机构地区：[1]中国科学技术大学近代物理系,安徽合肥230026

出　　处：《中国科学技术大学学报》2014年第12期1001-1006,共6页JUSTC

基　　金：国家自然科学基金(U1232206)资助

摘　　要：用基于非广延热力学Tsallis统计的爆炸波(Tsallis blast-wave,TBW)模型研究了RHIC能区200GeV质心能量氘核-金核(d+Au)碰撞系统中心快度区和前(后)向快度区轻强子和J/Ψ的横动量谱.在全动量区间,TBW模型可以很好地描述粒子谱.分析结果表明,200GeV d+Au中心碰撞中平均径向流不为零,其大小介于同能量的质子-质子(p+p)与金核-金核(Au+Au)碰撞系统之间,d+Au碰撞中存在显著的冷核物质(cold nuclear matter,CNM)效应.J/Ψ在中心快度区径向流为零,而在后向快度区具有非零的径向流,可能预示在d+Au碰撞系统中已探测到色玻璃凝聚(color glass condensate,CGC)效应.The blast-wave model based on the Tsallis statistics（TBW model）was used to study the particle production in 200 GeV d＋Au collisions at RHIC.Light hadrons and J/Ψtransverse-momentum spectra at both mid-rapidity and forward/backward rapidity were analyzed.It was found that a non-zero radial flow for light hadrons,indicating a strong cold nuclear matter（CNM）effect in d＋Au collisions.J/Ψshows a finite radial flow at the backward rapidity.This result may imply the onset of initial state color glass condensate（CGC）in the d＋Au collision system.

关 键 词：相对论重离子碰撞 d+Au碰撞系统 TBW模型 冷核物质效应 径向流 

分 类 号：O572.21[理学—粒子物理与原子核物理]